meronymy vs part to whole relation

meronymy and part to whole relation both are nouns.

Word	Noun	Adjective	Verb	Adverb
meronymy	Yes	No	No	No
part to whole relation	Yes	No	No	No

As nouns, meronymy and part to whole relation are synonyms defined as:

meronymy and part to whole relation: the semantic relation that holds between a part and the whole

meronymy (noun)	part to whole relation (noun)
the semantic relation that holds between a part and the whole	the semantic relation that holds between a part and the whole